Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution

Kim, Kyoung-Kook; Lee, Sam-Dong; Kim, Hyunsoo; Park, Jae-Chul; Lee, Sung‐Nam; Park, Young-Soo; Park, Seong-Ju; Kim, Sang Woo

doi:10.1063/1.3077606

Cited by 132 publications

(36 citation statements)

References 13 publications

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“…However, V 2 O 5 has hardly been considered as a candidate for light emitting due to the unsatisfying emission intensity. Recent papers reported that GaN based light emission diodes capped by ZnO layer or nanostructures showed enhanced light emission, which may provide an effective way to increase the light emission efficiency of luminescence materials [75], [76]. Thus it is interesting to investigate the light emission of V 2 O 5 /ZnO bi-layer composites in an effort to obtain enhanced light emission from ZnO incorporated V 2 O 5 nanostructures.…”

Section: Zno/v2o5 Bilayermentioning

confidence: 99%

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

Zou¹,

Gao²

2010

Transactions on Electrical and Electronic Materials

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This is an overview paper reporting our most recent work on processing and microstructure of nano-structured oxides and their photoluminescence and photo-catalysis properties. Zinc oxide and related transition metal oxides such as vanadium pentoxide and titanium dioxide were produced by a combination of magnetron sputtering, hydrothermal growth and atmosphere controlled heat treatment. Special morphology and microstructure were created including nanorods arrays, core-brushes, nano-lollipops and multilayers with very large surface area. These structures showed special properties such as much enhanced photoluminescence and chemical reactivity. The photo-catalytic properties have also been promoted significantly. It is believed that two factors contributed to the high reactivity: the large surface area and the interaction between different oxides. The transition metal oxides with different band gaps have much enhanced photoluminescence under laser stimulation. Use of these complex oxide structures as electrodes can also improve the energy conversion efficiency of solar cells. The mixed oxide complex may provide a promising way to high-efficiency photo emitting materials and photo-catalysts.

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Section: Zno/v2o5 Bilayermentioning

confidence: 99%

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

Zou¹,

Gao²

2010

Transactions on Electrical and Electronic Materials

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“…Extensive research efforts have been devoted to improving the light extraction from GaN-based LEDs by various approaches, including surface texturing, 1 patterned sapphire substrates, 2,3 reflectors, 4,5 photonic crystals, 6,7 nanopatterned surface 8,9 and flip-chip LEDs. 13,14 Influence of density of ZNAs on the light extraction efficiency was also experimental investigated. With vertical ZnO nanorods/nanotips grown on transparent p-electrode of GaN-LEDs by metal-organic chemical vapor deposition (MOCVD), 1.5 and 1.7 times enhanced light output power of GaN-LEDs compared with conventional GaN-LEDs were achieved, respectively.…”

Section: Introductionmentioning

confidence: 99%

Influence of the alignment of ZnO nanorod arrays on light extraction enhancement of GaN-based light-emitting diodes

Dai

Soh

Chua

et al. 2011

Journal of Applied Physics

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ZnO nanorod arrays (ZNAs) were hydrothermally synthesized on the surface of patterned indium-doped tin oxide p-type contact (PIPC) of GaN-based light-emitting diodes (GaN-LEDs) for enhancing the light extraction efficiency (LEE). It was found that the alignment of the ZnO nanorod arrays in the grooves of the PIPC was poorer than these grown on the ridges of the PIPC. By comparing the light output of the GaN-LEDs with and without ZNAs grown in the grooves of PIPC, the influence of the alignment of ZNAs on the LEE of GaN-LEDs was revealed and investigated. Numerical analysis based on the finite difference of time domain (FDTD) method suggested that the poorer alignment of ZNAs grown on GaN-LEDs resulted in more energy reflected back into GaN-LEDs and lower light extraction efficiency.

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“…This example shows that without changing the LED structure, by growing ZnO NRs it is easy to achieve higher-brightness LEDs. There were also reports about a dramatic increase in the light extraction efficiency of GaN-based blue LEDs by ZnO NRs arrays grown on a planar indium tin oxide (ITO)transparent electrode [31]. The light output efficiency of these LEDs was increased by about 57% with no increase in forward voltage over the conventional LEDs with planar ITO.…”

Section: Light Emitting Diodesmentioning

confidence: 99%

Applications of ZnO Nanorods and Nanowires - A Review

Witkowski

2018

Acta Phys. Pol. A

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This paper contains a review describing the various potential applications of ZnO nanorods in many different devices such as light emitters (light emitting diodes and lasers) and detectors (on single nanorod or nanorods matrices), photovoltaic cells (dye-sensitized, perovskite-based, thin film, organic and silicon solar cells), photocatalytic applications, field emitters, field effect transistors, chemical and biological sensors, and electric nanogenerators. The review describes state of art in this field from more than twenty years perspective, presenting problems and challenges to be solved.

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Enhanced light extraction efficiency of GaN-based light-emitting diodes with ZnO nanorod arrays grown using aqueous solution

Cited by 132 publications

References 13 publications

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

Fabrication, Optoelectronic and Photocatalytic Properties of Some Composite Oxide Nanostructures

Influence of the alignment of ZnO nanorod arrays on light extraction enhancement of GaN-based light-emitting diodes

Applications of ZnO Nanorods and Nanowires - A Review

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